A smattering of documents I've found online recently. Electronic surveillance, undercover police work, chemical warfare, biometrics, posters, Fort Meade, phone phreaking, and more.
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USPIS
Missing manuals from America's oldest federal law-enforcement agency, including "A Law Enforcement Guide to the U.S. Postal Inspection Service" and "Postal Inspector Entrance Examination Preparation Guide"
The Department of Justice coordinates the government's confiscation of private assets. These annual reports were in an archive on Justice's website. Now they're not.